摘要
通过含盐量对非有机质土加固强度影响的试验研究,得到了含盐量对水泥土强度的提高或减小的阈值为3.5%。当盐渍土的含盐量低于这个阈值时,盐渍土的加固强度会因可溶性盐的结晶膨胀作用,提高水泥土的强度;相反当盐渍土的含盐量高于该阈值时,盐渍土的强度会因可溶性盐的过多的结晶膨胀作用,使水泥土的结构遭到破坏,从而使水泥土的强度大大降低。同时分析了可溶性硫酸盐、镁盐和氯盐对水泥土的浸蚀性作用,并从盐类对水泥土强度的影响从机理上进行了阐释,提出了高含盐量对水泥土破坏作用的对策。
Through the laboratory test of the effect of salt contents on the strength of cement - mixed non - organic clays, The threshold of 3.5% was obtained. When the salt content of the clay is lower than this value, the strength of cement - soil will be increased due to solute salt＇s dcrystallization and expansion. Conversely, when the soil have a higher salt content than the threshold, the strength of cemented clays will be greatly reduced due to structural destruction of cemented clays by the excessive crystallization and expansion of the salt. In addition, the corrosion mechanism of sulfate, chloride and magnesium salt to cemented clays is also discussed. And finally, based on the mechanism of the effect of salt on the strength of the cement - mixed clays, the prevention measures are suggested in case of the destruction to the cemented - mixed clays under high salt content conditions.
出处
《工程地质学报》
CSCD
2007年第1期139-143,共5页
Journal of Engineering Geology
关键词
水泥土
含盐量
无侧限抗压强度
阈值
Cement -mixed clays, Salt contents, Unconfined compressive strength, Threshold
